We are looking forward for the polysilicon block as follows:1. The parameter of polysilicon Boron 20mm ②small block >2mmAppearance: Even if the surface have the carbon available2. Tailing Resistivity: N type>1 Ohm.cm P type>0.5 Ohm.cm Dimension: big > 50mm small > 5mm3. Quantity: 5~10 tons monthIf you are interesting, please you offer best pirce.